1812 – George James Allman was born in Cork, Ireland.
1843 – He graduated his degree in Medicine in Dublin.
1844 – He was awarded a degree in Arts and Medicine at Trinity College in Dublin.
1844-1856 – He was appointed as a professor of botany in Trinity College, Dublin.
1854 – He was elected in the Fellow of the Royal Society.
1856-1870 – He was appointed Regius Professor of Natural History in the University of Edinburgh.
1873 – He was awarded a Gold Medal of the Royal Society.
1877 – He was awarded a Brisbane Gold Medal of the Royal Society of Edinburgh.
1878 – He was awarded a Conningham Gold Medal of the Royal Irish Academy.
1879 – He was elected as a President of the British Association for the Advancement of Science.
1896 – He was awarded a Gold Medal of the Linnean Society.
1870 – He resigned his chair at Edinburgh due to poor health.
1871-1872 – He published his most important work about gymnoblastic hydrozoa.
1898 – He died on the 24th of November.